With the continuous development of the coal gasification industry in China, the total amount of coal gasification slag is also in⁃creasing, and has become one of the urgent problem. In order to make full use of gasification slag, broaden its application scenario and re⁃flect the potential resource value, a lot of exploration has been carried out in the industries of construction materials, ceramics, molecularsieves, catalysts, etc., and it has been successfully used. However, during the coal gasification process, harmful heavy metal elements(Hg, Cr, Cd, Pb, Zn, Ni) in coal will remain in the gasification slag, which may be released or leached into the environment with pre⁃cipitation, causing adverse effects on the ecological living environment and human life and health, and affecting the comprehensive utiliza⁃tion of coal gasification slag. In the process of gasification, the release of heavy metals in coal is affected by the gasificationtemperature, mode and atmosphere, and different kinds of heavy metals are affected by these conditions in different ways and to differentdegrees. For heavy metals in gasification slag, the leaching rate is influenced by leachate pH, leaching temperature, solid-liquid ratio,particle size and leaching time, among which leachate pH is the main influencing factor. In order to stabilize the heavy metals in slag, re⁃duce the release and leaching of heavy metals and reduce the pollution to the environment, the sequestration treatment technology of heavymetals in coal gasification ash slag is systematically summarized and classified into six ways, such as cement sequestration, heat treatmentsequestration, hydrothermal treatment sequestration, additive sequestration, chemical co-precipitation sequestration and co-consolidationof mineralization according to the sequestration method.